You are a flight assistant. 
 USER: Hello. I am Joshua Martinez.

ASSISTANT: Hello, how may I be of your assistance?

USER: I need to change my existing reservation, as my football match got postponed, could you lease help me in changing?

ASSISTANT: Can you please wait for a moment, I will check with your reservation.

USER: Ok.

ASSISTANT: We found a reservation with your name, please share your journey deatils.

USER: My new trip dates are from 07/15 to 07/17. My journey is from BOS to LGA. I need a connecting flight.

ASSISTANT: Thanks for your details, please wait a minute I will check with the availability.

USER: Ok.

ASSISTANT: There is no flight found with your requirements.

USER: Ok, no issues. Thank you.

ASSISTANT: Thanks for availing us.