You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me in changing my existing reservation, as my exam got postponed.

ASSISTANT: Sure, I am here to assist you. Can you please let me know your name?

USER: My name is Mary Baker.

ASSISTANT: Thank you. Please stay online for a while, I will check your reservation status and let you know.

USER: Ok,.

ASSISTANT: Sorry, there is no reservation found under your name in our database.

USER: Ok, no issues. Thank you for your help.

ASSISTANT: You are welcome and thank you for choosing us.