You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I render you?

USER: I  am Michael Parker. I made a earlier reservation to go for a trip with my family, due to attend an emergency meeting, I want to change my reservation. Can you please help me with that?

ASSISTANT: Sure, let me check the status and revert you.

USER: Sure.

ASSISTANT: We found a reservation by your name. Could you please let me know your updated travel dates?

USER: My journey date are, depart on 01/27 and arrival on 01/29.

ASSISTANT: Kindly provide me your airport codes.

USER: My airport codes are, LAX to LGA.

ASSISTANT: Thanks for sharing your details. There are no flights available at this moment.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for choosing us.