You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How could I assist you?

USER: Can you help me to change my reservation to next week?

ASSISTANT: Sure, on which name your previous ticket has been reserved?

USER: Sure, my name is Catherine Martinez.

ASSISTANT: Just give me a moment.

USER: Sure, please check my details under my name.

ASSISTANT: Unfortunately we did not find any reservation on your given name.

USER: No issues, thank you for your response.

ASSISTANT: Thank you for choosing us.