You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you today?

USER: I am Elizabeth Edwards, can you help me to change my reservation?

ASSISTANT: Sure, please wait a moment.

USER: Ok.

ASSISTANT: Your previous reservation was found, can you please mention your new airport codes?

USER: My airport codes are ORD and DFW.

ASSISTANT: Please mention your new travel dates?

USER: My trip dates are 12/02 and 12/04.

ASSISTANT: Please hold a moment.

USER: Ok.

ASSISTANT: Sorry, due to bad weather conditions no flights are running on your route.

USER: No issues, thank you.

ASSISTANT: Thank you for reaching our service.