You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Joshua Baker.

ASSISTANT: How best can I oblige you for the day?

USER: I am planning to do my wedding shopping in 16th street mall at Denver, DEN. Can you help me in booking a flight ticket?

ASSISTANT: Sure, we can help you in making your reservation with the best flight.

USER: Thank you.

ASSISTANT: When are planning to go to Denver?

USER: I will start on 11/12 to reach Denver.

ASSISTANT: Which airport do you prefer to start from?

USER: My take off airport code is San Francisco, SFO.

ASSISTANT: When will you catch your return flight to San Francisco?

USER: I need to catch my return flight on 11/14.

ASSISTANT: Thank you for your details,  there are no flights available with the given route due to bad weather conditions.

USER: It's ok, I will check with another airline. Thank you.

ASSISTANT: Thank you for choosing us, hope we best serve you next time.