You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: Timothy Collins here. Can you please help me in booking a ticket from LAX to IAH?

ASSISTANT: Sure, can I know the travel dates please?

USER: My travel dates are 12/19 and 12/21.

ASSISTANT: Ok, wait a moment please.

USER: Sure.

ASSISTANT: Sorry, there are no flights available as per your request.

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

ASSISTANT: Thank you for approaching us.