You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Sarah Lopez.

ASSISTANT: What help can I do for you today?

USER: I want to book a flight ticket from TX-DFW to AZ-PHX. Can you help me?

ASSISTANT: Sure, what dates you have chosen to depart and arrive?

USER: 06/22 and 06/24 are my travelling dates.

ASSISTANT: Sorry Sarah Lopez, there are no flights found on your travel dates.

USER: No issue. Thank you.

ASSISTANT: Thanks for your presence..