You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I support you?

USER: I am Helen Miller. Due to hurricanes my planned to visit for trip has been postponed.I would like to change my existing reservation. Could you please help me?

ASSISTANT: Sure, let me check the status and revert you.

USER: Ok.

ASSISTANT: We found a reservation on your name. Please let me know your updated dates.

USER: My updated dates are 05/31 and 06/02.

ASSISTANT: Kindly share me your airport codes.

USER: My airport codes are from NY-LGA to TX-DFW.

ASSISTANT: Thanks for sharing your details. There are no flights at this moment.

USER: Ok, not an issue.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your help.