You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Rachel Hall.

ASSISTANT: How can I help you at this moment?

USER: Please, reserve me a flight ticket from BOS to DEN.

ASSISTANT: Sure, can you please mention your travel dates?

USER: My trip dates are 12/07 and 12/09.

ASSISTANT: Thank you for waiting. There are no flights available in this route as per your travel dates.

USER: That's ok, no problem. Thank you for your information.

ASSISTANT: You are welcome, thank you for reaching our agency.