You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Can you please help me to book a ticket from CLT to SFO?

ASSISTANT: Sure, I am here to help you with that. May I know your travelling dates, please?

USER: I want to start on May 27 and return on May 29.

ASSISTANT: May I know your name please?

USER: Rachel Scott here.

ASSISTANT: Is there any class preference?

USER: I would prefer economy class.

ASSISTANT: Do you have any other other specifications?

USER: I want to depart in the morning.

ASSISTANT: There are no flights found on this route as per your travel dates.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for reaching us, have a great day.