You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I have reserved a seat earlier with my name Dorothy Lewis, but I would to change to other place because of bad weather. Will you assist me?

ASSISTANT: Sure, I will assist you with changing your reservation.

USER: Thank you.

ASSISTANT: Please give me a minute.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found with the given name.

USER: Thanks for your response.

ASSISTANT: Thank you for reaching us.