You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I want to travel from HOU to DEN. Can you help me to book a flight ticket?

ASSISTANT: Sure, I am happy to help you, can you please mention your travelling dates?

USER: I want to fly in the flight on July 29 and July 31.

ASSISTANT: May I know your specifications?

USER: I am looking for a direct flight.

ASSISTANT: Please wait a moment, let me check with the availability.

USER: Ok, take your time.

ASSISTANT: Sorry, there are no flights running on your route due to bad weather forecast.

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

ASSISTANT: May I know your name for our documentation purpose.

USER: I am Paul Parker.

ASSISTANT: Thank you for reaching our service.