You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you for today?

USER: I am Sharon Hernandez, in my previous reservation I gave wrong airport codes, so can you help me for changing an existing reservation?

ASSISTANT: Sure, I am happy to help you. Please wait for a moment to check your details.

USER: Ok, I will wait for your reply.

ASSISTANT: No reservation found for this search. Sorry for inconvenience.

USER: Oh! No problem, thank you for your quick response.

ASSISTANT: You are welcome.