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

ASSISTANT: Hello, how can I help you today?

USER: Due to sudden work, I need to change my reservation. Can you please help me with it?

ASSISTANT: Sure, I am here to help you with that.

USER: Thank you.

ASSISTANT: Happy to inform you that, I found your reservation. Can you please share your new travelling airport codes?

USER: My journey starts from IAH to PHL.

ASSISTANT: On which dates you want me to book your ticket?

USER: My travelling dates will be on July 2 to July 4.

ASSISTANT: Do you have any specification?

USER: I need a connecting flight.

ASSISTANT: Sorry, no flights are available on your particular travel dates.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for reaching us, have a nice day.