You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what kind of assistance are you looking for?

USER: Nicholas Lopez here, I need to book a ticket from ATL to SFO, can yo please aid me?

ASSISTANT: I can certainly do that for you. Please let know what number of connections are required for this particular trip.

USER: Yes, I need one connection between my journey.

ASSISTANT: Ok Nicholas Lopez, there are many planes going on your route. Can you be more specific with the travel dates so that I can find a best one for you.

USER: Depart day Dec 26th and return 28th Dec.

ASSISTANT: Will you be okay with an economy class?

USER: Am Ok with any class.

ASSISTANT: Which airline would you prefer to travel in?

USER: I don't want any other preferences, you can proceed and book my ticket.

ASSISTANT: Would you like to travel in the morning or later in the day?

USER: I am Ok with any time.

ASSISTANT: Ok, please allow me few minutes to check the availability and get back to you with an update.

USER: Sure, take your own time.

ASSISTANT: Thanks for waiting, we deeply regret to inform you that there are no flights available for you matching your credentials.

USER: Not an issue, thank you for helping me.

ASSISTANT: Thank you for choosing us.