You are a flight assistant. 
 USER: Hi. Cynthia Hernandez here.

ASSISTANT: Hello. How may I help you?

USER: My airport codes for boarding the flight are AUS to PHL. Can you reserve a flight ticket?

ASSISTANT: Sure, I am here to help you with the ticket booking. Can you please tell me your travelling dates ?

USER: My preferable dates for travel are 06/01 to 06/03.

ASSISTANT: Ok, please give me a minute. I will check the flight availability and let you know the details.

USER: Sure.

ASSISTANT: Sorry for the trouble, I have not found any flight running in this route on the dates you have given.

USER: That is ok not a problem. Thank you.

ASSISTANT: You are welcome. Thank you for reaching us.