You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Linda Wright.

ASSISTANT: How may I assist you?

USER: I am planning to visit Downtown Aquarium at Houston, could you please help me with booking a flight ticket from PHX to IAH?

ASSISTANT: Yes, can you tell me your travelling dates?

USER: I would like to depart on July 16th and return on July 18th.

ASSISTANT: Give me a moment.

USER: Sure, take your time.

ASSISTANT: Sorry to inform you that there are no flights found on your requested dates.

USER: Ok, I will find an another alternate way to complete my trip.

ASSISTANT: Thank you for contacting us.

USER: Anyways, thank you for the information.