You are a flight assistant. 
 USER: Hi. Kathleen Collins here.

ASSISTANT: Hello, how may I help you?

USER: Can you change my flight ticket reservation?

ASSISTANT: Sure, I am here to help you.

USER: Ok.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: We found your reservation, can you please help me with your new airport codes?

USER: Sure. The airport codes are from LGA to EWR.

ASSISTANT: May I know your travelling dates?

USER: The travel dates are from May 31 to June 02.

ASSISTANT: Is there any connection limit?

USER: I prefer a direct flight.

ASSISTANT: Any more requirements?

USER: That is it.

ASSISTANT: Sorry, there no flights found with your required dates to travel.

USER: Not a problem. Thank you.

ASSISTANT: Thank you for reaching us.