You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Nichole Mitchell.

ASSISTANT: How can I assist you today?

USER: Can you please book a flight ticket from Washington to San Francisco?

ASSISTANT: Sure, may I know your airport codes?

USER: DCA is my origin and SFO is my destination.

ASSISTANT: On what dates you are planned to travel?

USER: 10/09 and 10/11 are my travelling dates.

ASSISTANT: Thanks for giving details, no flights are available at your route due to bad weather conditions.

USER: Ok, no issues. Thanks for your service.

ASSISTANT: Thank you for choosing us.