You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I know you?

USER: Due to my ill health, I would like to change my existing reservation. Please help me out.

ASSISTANT: Sure, may I know your name please to check the reservation status?

USER: Sure, my name is Jessica Collins.

ASSISTANT: Jessica, there is no reservation found with your details.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for contacting us.