You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: I am Sarah Garcia, can you help me to change my reservation?

ASSISTANT: Sure, I will help you with this.

USER: Good to hear that from you.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry Sarah, there is no reservation found as per your name to change your reservation in your database.

USER: That is fine. Thank you for your help.

ASSISTANT: You are welcome.