You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am looking to do some changes in my existing reservation. Can you help me for that?

ASSISTANT: Sure, please help me with your name to check your reservation details in our database.

USER: My name is Nicole Allen.

ASSISTANT: Thank you, please wait for a while.

USER: Sure, I will wait for your response.

ASSISTANT: I am sorry to say you that there is no reservation found under your name in our database.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for choosing us.

USER: Welcome.