You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am planning to book a ticket from JFK to IAH. Can you please help me out?

ASSISTANT: Sure, may I know your travel dates?

USER: I am planning to travel on July 14 and return back on July 16.

ASSISTANT: Sure, do you have any requirements?

USER: Yes, I am looking for a economy class.

ASSISTANT: May I know your name?

USER: I am Samuel Scott.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry to say you that there is no flight available on your preferred travel dates.

USER: That's fine, thank you for your service.

ASSISTANT: You are welcome and thank you for choosing us.