You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you today?

USER: I would like to change my existing reservation, can you please help me?

ASSISTANT: Sure, I will help you with that. May I know your good name?

USER: Thank you. My name is Stephanie Harris.

ASSISTANT: Ok, please wait for a while.

USER: Sure, I will wait for your response.

ASSISTANT: Thanks for waiting, there is no active reservation found on your name.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for reaching us.