You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: I am Carol Hall.

ASSISTANT: How may I aid you now?

USER: I would like to attend an interview in HQ Software at San Francisco, SFO.

ASSISTANT: Ok.

USER: Can you please make a reservation from Denver, DEN?

ASSISTANT: Sure, I am glad to help you. Let me know your travelling dates.

USER: My journey dates on 01/25 and 01/27.

ASSISTANT: Wait a while.

USER: Sure.

ASSISTANT: Thanks for waiting. Unfortunately, We have no flights that matches with your information.

USER: Ok, no issue.

ASSISTANT: Thank you for opting us.

USER: Thank you for your information.