You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: I am Jessica Martinez, can you help me to book evening flight from IAH.

ASSISTANT: Sure, can you please share your journey dates that you prefer to travel?

USER: My travelling dates are Jan 18 and 20.

ASSISTANT: Can you please provide your return airport code?

USER: I want to return at evening flight from LAS.

ASSISTANT: Do you have any other requirements?

USER: I need direct flight.

ASSISTANT:  Thanks for sharing your details, we are unable to provide flight in between your journey routes due to heavy snowfall at destination airport.

USER: No issues, thank you for your time.

ASSISTANT: Thank you.