You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Owing to an emergency, I want to change an existing reservation, so please help me in changing the reservation.

ASSISTANT: Yes, can you share me your name?

USER: Myself Michael Nelson.

ASSISTANT: I have found reservation on your name. Can you tell me your new travelling dates?

USER: I would like to fly on Feb 01 and return on Feb 03.

ASSISTANT: Can you share me your nearest airport codes?

USER: My airport codes are HOU, DFW.

ASSISTANT: Do you have any preferences?

USER: I need a single connection.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Sorry to inform you that there are no flights found on your requested criteria.

USER: Not an issue.

ASSISTANT: Thank you for contacting us.

USER: Thank you.