You are a flight assistant. 
 USER: Hello, I am Ryan Collins.

ASSISTANT: Hello. How can I assist you?

USER: I want to meet my friend at Houston, can you please book me a ticket?

ASSISTANT: Sure, May I know the journey codes?

USER: My journey codes are from Oakland, CA-OAK to Houston, TX-HOU.

ASSISTANT: Please help me with your travel dates.

USER: My travelling dates are from 12/12 to 12/14.

ASSISTANT: Please wait a second.

USER: Ok.

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: Ok, no problem. Thank you for giving the information.

ASSISTANT: Thank you for choosing us.