You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Myself Sandra Garcia, I need to schedule my trip to Phoenix for next week. Could you please help me in booking the ticket from DEN to PHX?

ASSISTANT: On which dates you are willing to travel?

USER: I have to reach Phoenix by 01/17, and again I will be return back on 01/19.

ASSISTANT: Please wait a minute.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry Garcia, there is no flights available on these dates.

USER: Not a big problem, anyhow thank you very much for your help.

ASSISTANT: Most welcome.