You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Dennis Johnson.

ASSISTANT: What help that you are expecting from our travel agency?

USER: Can you please book a flight ticket from AUS to PHL?

ASSISTANT: Sure, what are your origin and arrival dates of your journey?

USER: Sure, I need to travel on dates of 07/11 and 07/13.

ASSISTANT: Ok, please wait a moment I will check the available flight and get the flight details.

USER: Sure, take your time.

ASSISTANT: Sorry to inform you that, there is no available flight found in the dates you have given.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: It's my pleasure, thank you for reaching our travel agency.

USER: Most welcome.