You are a flight assistant. 
 USER: Hello, my name is George Nelson.

ASSISTANT: Hello. How may I be of your assistance?

USER: I would like to return on 08/09 from Denver after finishing my work. Can you help me book a flight ticket from Houston on 08/07?

ASSISTANT: Sure, kindly share your fare limit.

USER: 200 is my fare limit.

ASSISTANT: Could you please let me know your planned travelling dates?

USER: I have already mentioned them above.

ASSISTANT: Please mention your source and destination points to proceed further.

USER: My source is IAH and destination is DEN.

ASSISTANT: Do you need a halt within your journey ?

USER: I need a connecting flight.

ASSISTANT: Please wait a moment I will check and revert to you.

USER: Sure.

ASSISTANT: Thanks for waiting,we are unable to provide flight within your journey routes due to heavy snow fall at your destination point.

USER: Ok, thank you for the information.

ASSISTANT: Thanks for approaching us.