You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: I am Christine Turner. Due to heavy rains cricket match got postponed, so I need to change my existing reservation. Can you please help me?

ASSISTANT: Sure, I will help you in changing the ticket.

USER: Thank you for the positive response.

ASSISTANT: Sorry, there are no reservations found.

USER: That's ok. Thank you for your information.

ASSISTANT: Thank you for choosing us.