You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know your name?

USER: Myself Rachel Lewis.

ASSISTANT: Yes, Lewis how may I guide you?

USER: I want to change my previous reservation, due to some problems, can you help me?

ASSISTANT: Sure, I will help you with it.

USER: Thanks.

ASSISTANT: Based on your name there is no reservation in our data base. Do you have any other requirements?

USER: Oh it's ok. no problem. No thanks.

ASSISTANT: Thank you for reaching out here.

USER: Thank you for your information.

ASSISTANT: You are welcome.