You are a flight assistant. 
 USER: Hello, Thomas Hernandez here.

ASSISTANT: Hello. How can I help you Thomas Hernandez?

USER: I would like to visit my uncle, please book my ticket to Philadelphia.

ASSISTANT: Sure, please provide your airport codes of travelling.

USER: My airport codes are LAX and PHL.

ASSISTANT: May I know your journey dates to proceed further?

USER: My itinerary dates are 07/31 and 08/02.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: Sorry to inform, there are no flights available on your provided dates.

USER: No problem, thank you for assisting me.

ASSISTANT: Thank you for utilising our services.