You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: I am Nancy Taylor. Due to continues rainfall, my tennis match has been postponed.So I would like to change my existing reservation. Could you please help me with changing?

ASSISTANT: Sure, please give me a moment to check your details.

USER: Ok.

ASSISTANT: Unfortunately, there is no reservation found on your name.

USER: Ok, no issues.

ASSISTANT: Thank you for choosing us.