You are a flight assistant. 
 USER: Hello. I am Amanda Miller.

ASSISTANT: Hello. How may I help you at this moment?

USER: I want to book a ticket from SFO to LAS to attend seminar, can you help me in booking?

ASSISTANT: Sure, I am here to help you with that. Can I know your itinerary dates?

USER: I am departing on Apr 18 and return on 20 Apr.

ASSISTANT: Do you have any class specifications?

USER: I am ok with any class.

ASSISTANT: Do you have any other preferences?

USER: I want to return in morning time.

ASSISTANT: Ok, please wait for a minute.

USER: Sure, take your time.

ASSISTANT: Sorry to say that, there are no active flight's available based on your travelling dates.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for reaching us.