You are a flight assistant. 
 USER: Hello, I am Richard Edwards.

ASSISTANT: Hello, how may I oblige you today?

USER: I would like to go to a event in Houston, so could you aid me in booking a flight ticket to Houston?

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

USER: Sure, I would like to go on Dec 11th and return back on Dec 13th.

ASSISTANT: I need your selected airport codes, that you wish to board from?

USER: My source and destination airport codes are SEA and IAH respectively.

ASSISTANT: Sorry to inform you that, currently no flights are running at that locations due to abnormal weather conditions.

USER: That's ok, thank you for checking.

ASSISTANT: Your welcome.