You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Dorothy Thomas.

ASSISTANT: How can I help you?

USER: Actually, I have done booking to attend my cousin wedding but due my exams in front which is very important to my career I feel to cancel my reservation. Can you help me out of it?

ASSISTANT: Sure, I will help you that. Give me a minute.

USER: Thank you for your positive response.

ASSISTANT: I am sorry to say that there is no reservation found.

USER: Oh! ok that's fine.

ASSISTANT: Thank you for contacting us.

USER: Thank you for the information.

ASSISTANT: Welcome.