You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Charles Edwards.

ASSISTANT: Nice to meet you Edwards. In which way I can assist you now?

USER: I booked a flight with mismatched airport codes, so can you help me to change an existing reservation?

ASSISTANT: Sure, I will help you with that.

USER: Ok.

ASSISTANT: Please give me a moment to check whether the reservation existing or not. Thank you for waiting. Sorry Edwards, I have not found your name in the reservation chart to change it.

USER: Ok, that's fine. Thank you for your quick response.

ASSISTANT: I would like to suggest one thing that please care should be take while booking next time.

USER: Thank you for your suggestion.

ASSISTANT: Most welcome. Thank you for choosing us. Have a good day.